--- a/QtSingleApplicationQt5/qtlocalpeer.cpp	2015-06-29 18:39:14.977744557 -0400
+++ b/QtSingleApplicationQt5/qtlocalpeer.cpp	2015-06-29 18:39:24.680844220 -0400
@@ -41,6 +41,7 @@
 #include "qtlocalpeer.h"
 #include <QCoreApplication>
 #include <QTime>
+#include <QDataStream>
 
 #if defined(Q_OS_WIN)
 #include <QLibrary> 
